Optical component, touchscreen panel, and display device

Abstract

The invention provides an optical component including a resin part having translucency and a phase plate. The phase plate is configured to be disposed on an emitting direction side of a display part capable of emitting linearly polarized light. The resin part is uncontrolled in terms of phase difference. The phase plate is configured to be disposed between the display part and the resin part. The phase plate has three to five times as large retardation as the resin part.

The invention claimed is: 
     
       1. A touchscreen panel comprising:
 an optical component including: 
 a resin part having translucency, the resin part being configured to be disposed on an emitting direction side of a display part capable of emitting linearly polarized light, the resin part being a molded article of resin material partially having birefringence due to molecular orientation and/or photoelasticity of the resin material, or alternatively the resin part being an extruded plate of resin material having birefringence due to an extruding process of the resin material, and 
 a phase plate configured to be disposed between the display part and the resin part, the phase plate having a retardation that is three to five times larger than a retardation of the resin part or alternatively having a retardation of at least 3,000 nm; and 
 a plurality of optically isotropic members, the optically isotropic members including:
 at least one first optically isotropic member including a sensor capable of detecting an approach of a detection target, and 
 at least one second optically isotropic member, 
 
 wherein the touchscreen panel is configured such that only the at least one first optically isotropic member is disposed between the resin part and the phase plate of the optical component, and that only the at least one second optically isotropic member is disposed between the phase plate of the optical component and the display part. 
 
     
     
       2. The touchscreen panel according to  claim 1 ,
 wherein the phase plate is oriented such that an optic axis of the phase plate forms an angle of approximately 45 degrees with a polarization axis of the linearly polarized light emitted from the display part. 
 
     
     
       3. A display device comprising:
 a display part capable of emitting linearly polarized light; and 
 the touchscreen panel according to  claim 1 . 
 
     
     
       4. The touchscreen panel according to  claim 1 , wherein the retardation of the phase plate is at least 5,000 nm. 
     
     
       5. The touchscreen panel according to  claim 4 , wherein the retardation of the phase plate is at least 10,000 nm. 
     
     
       6. A touchscreen panel comprising:
 an optical component including: 
 a resin part having translucency, the resin part being configured to be disposed on an emitting direction side of a display part capable of emitting linearly polarized light, the resin part being a molded article of resin material partially having birefringence due to molecular orientation and/or photoelasticity of the resin material, or alternatively the resin part being an extruded plate of resin material having birefringence due to an extruding process of the resin material, and 
 a phase plate configured to be disposed between the display part and the resin part, the phase plate having a retardation that is three to five times larger than a retardation of the resin part or alternatively having a retardation of at least 3,000 nm; and 
 at least one optically isotropic member including a sensor capable of detecting an approach of a detection target, 
 wherein the touchscreen panel is configured such that only the at least one optically isotropic member is disposed between the phase plate of the optical component and the display part. 
 
     
     
       7. The touchscreen panel according to  claim 6 ,
 wherein the phase plate is oriented such that an optic axis of the phase plate forms an angle of approximately 45 degrees with a polarization axis of the linearly polarized light emitted from the display part. 
 
     
     
       8. A display device comprising:
 a display part capable of emitting linearly polarized light; and 
 the touchscreen panel according to  claim 6 . 
 
     
     
       9. The touchscreen panel according to  claim 6 , wherein the retardation of the phase plate is at least 5,000 nm. 
     
     
       10. The touchscreen panel according to  claim 9 , wherein the retardation of the phase plate is at least 10,000 nm. 
     
     
       11. A touchscreen panel comprising:
 an optical component including: 
 a resin part having translucency, the resin part being configured to be disposed on an emitting direction side of a display part capable of emitting linearly polarized light, the resin part being a molded article of resin material partially having birefringence due to molecular orientation and/or photoelasticity of the resin material, or alternatively the resin part being an extruded plate of resin material having birefringence due to an extruding process of the resin material, and 
 a phase plate configured to be disposed between the display part and the resin part, the phase plate having a retardation that is three to five times larger than a retardation of the resin part or alternatively having a retardation of at least 3,000 nm; and 
 at least one optically isotropic member including a sensor capable of detecting an approach of a detection target, 
 wherein the touchscreen panel is configured such that only the at least one optically isotropic member is disposed between the resin part and the phase plate of the optical component.